The Thirty-first Congress, assembled in December, 1849, was the one which enacted the series of measures known as the “Compromise of 1850,” and which settled all the slavery questions that remained for adjustment. In respect to the territory that had been acquired from Mexico, there was danger for a time that all harmony of action would be frustrated by the so-called “Wilmot Proviso,” which aimed to impose as a fundamental condition of any legislation respecting any part of that territory, a perpetual exclusion of slavery. Mr. Buchanan was out of public office at this time, but his influence was exerted in his own State, with success, to prevent the passage by her legislature of instructing resolutions in favor of that proviso. This led the way for its rejection by Congress. On the 4th of February, 1850, resolutions favoring the proviso were laid upon the table of the House of Representatives in Congress, by the vote of 105 to 75. This important vote was followed in the Senate by five measures, designed by Mr. Clay and supported by Mr. Webster and Mr. Calhoun, which, after a long discussion, became laws in September, 1850, with the general concurrence of both the Whig and the Democratic parties. The first of these Acts consisted of a new and more efficient law for the extradition of fugitives from service, to take the place of the old law of February 12th, 1793, which bore the signature of Washington. By reason of a decision of the Supreme Court, made in 1842, which had determined that Congress could not constitutionally require State magistrates to perform a duty which the Court declared to be one pertaining exclusively to the Federal power, the law of 1793 had become almost inoperative. Although the decision of the Court left the States at liberty to allow their magistrates to act in such cases, many of the Northern States had passed laws to prohibit them from rendering any official aid to the claimant of a fugitive from service. It had become necessary, therefore, for Congress to provide officers of Federal appointment to execute an express mandate of the Federal Constitution. This was the purpose of the new law of 1850.